[TowerTalk] Isolation and SWR

[Jim Lux]

On 9/10/12 12:10 PM, Pete Smith N4ZR wrote:
> 190 feet of LDF4-50.  Then I think what you're saying is that isolation
> (or the lack) isn't responsible for much of what I am seeing.


well.. since LDF4-40 has 0.2 dB/100ft loss, I don't think that's 
accounting for it.  0.8 dB return loss is a pretty big VSWR number.

You might be seeing something else.  Maybe parasitic C to the case or 
control wires or something, and it just happens to be the right amount 
to almost match.





>
> 73, Pete N4ZR
> The World Contest Station Database, at www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com,
> spots at telnet.reversebeacon.net, port 7000 and
> arcluster.reversebeacon.net, port 7000
>
> On 9/10/2012 12:46 PM, Steve Hunt wrote:
>> Not sure what your feedline length and type are, but just 2dB of loss
>> in that line would give you a 4.5:1 SWR at the shack end if it were
>> left completely unterminated at the other end.